Type of Document	Master's Thesis
Author	Hu, Guang-hua
URN	etd-11142012-040111
Title	Extending the depth of focus using digital image filtering
Degree	Master of Science
Department	Electrical Engineering
Advisory Committee	Advisor Name Title Pieper, Ronald J. Committee Chair Claus, Richard O. Committee Member Poon, Ting-Chung Committee Member
Keywords	Image processing
Date of Defense	1987-04-15
Availability	restricted
Abstract Two types of image processing methods capable of forming a composite image from a set of image slices which have in-focus as well as out-of-focus segments are discussed. The first type is based on space domain operations and has been discussed in the literature. The second type, to be introduced, is based on the intuitive concept that the spectral energy distribution of a focused object is biased towards lower frequencies after blurring. This approach requires digital image filtering in the spatial frequency domain. A comparison among methods of both types is made using a quantitative üdelity criterion.
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